/*
TODO
5. (optional) set your project homepage, license, and maintainers list on lines 48-51
6. (optional) uncomment the NixOS module and update it for your needs
7. Delete this comment block
*/

/*
Some utility commands:
- `nix flake update --commit-lock-file`
- `nix flake lock update-input <input>`
- `nix build .#nicks_nextcloud_integrations` or `nix build .`
- `nix run .#nicks_nextcloud_integrations` or `nix run .`

Updating `cargoHash`:
- Set `cargoHash` to an empty string
- run `nix run .#nicks_nextcloud_integrations`
- Update `cargoHash` with correct hash from output
rust-project TODO: write shell script for automatically updating `cargoHash`
*/

{
  description = "A group of utilities Nick created to manage his server through nextcloud notes";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = { self, nixpkgs, rust-overlay }:
    let
      overlays = [ (import rust-overlay) ];
      system = "x86_64-linux";
      pkgs = import nixpkgs {
        inherit system overlays;
      };
      rustSettings = with pkgs; {
        src = ./.;
        nativeBuildInputs = [ pkg-config ];
        buildInputs = [ openssl hddtemp ];
        cargoHash = nixpkgs.lib.fakeHash;
      };
      meta = with nixpkgs.lib; {
        #homepage = "https://example.com";
        #license = [ licenses.gpl3 ];
        platforms = [ system ];
        #maintainers = with maintainers; [ ];
      };
    in {
      devShells.${system}.default = with pkgs; mkShell {
        packages = [
          (pkgs.rust-bin.stable.latest.default.override {
            extensions = [ "rust-src" ];
          })
          bacon
        ];
        inputsFrom = with self.packages.${system}; [ status_cloud ];
      };
      packages.${system} = {
        status_cloud = pkgs.rustPlatform.buildRustPackage (rustSettings // {
          pname = "status_cloud";
          version = "0.1.0";
          buildAndTestSubdir = "status_cloud";
          cargoHash = "sha256-mMxHI/rU1Gd5UR+hZ+5+FnBrff8uF+SrEvGJT7wh5tI=";
          preBuild = ''
            sed -i 's/Command::new("hddtemp")/Command::new("${nixpkgs.lib.escape [ "/" ] "${pkgs.hddtemp}"}")/g' status_cloud/src/main.rs
          '';
          meta = meta // {
            description = "Server status saved to a nextcloud note service.";
          };
        });
      };
      nixosModules.default = { config, ... }: let
        lib = nixpkgs.lib;
      in {
        # status_cloud
        options.services.status_cloud = {
          enable = lib.mkEnableOption (lib.mdDoc "status_cloud service");
          package = lib.mkOption {
            type = lib.types.package;
            default = self.packages.${system}.status_cloud;
            defaultText = "pkgs.status_cloud";
            description = lib.mdDoc ''
              The status_cloud package that should be used.
            '';
          };
          config_path = lib.mkOption {
            type = lib.types.path;
            description = lib.mdDoc ''
              The file path to the toml that contains user information secrets
            '';
          };
          frequency = lib.mkOption {
            type = lib.types.int;
            description = lib.mdDoc ''
              The number of minutes to wait between updates
            '';
          };
        };
        config.systemd.services.status_cloud = let
          cfg = config.services.status_cloud;
          pkg = self.packages.${system}.status_cloud;
        in lib.mkIf cfg.enable {
          #description = pkg.meta.description;
          description = "Status Cloud";
          serviceConfig = {
            Type = "oneshot";
            ExecStart = ''
              ${cfg.package}/bin/status_cloud --config-file ${builtins.toString cfg.config_path}
            '';
          };
        };

        config.systemd.timers.status_cloud = let
          cfg = config.services.status_cloud;
          pkg = self.packages.${system}.status_cloud;
        in lib.mkIf cfg.enable {
          wantedBy = [ "timers.target" ];
          partOf = [ "status_cloud.service" ];
          timerConfig.OnCalendar = [ "*:0/${builtins.toString cfg.frequency}" ];
        };

      };
    };
}